Tool-holder.



F. SELBY. TOOL HOLDER. APPLICATION FILED MAY 9. l9l 6.,

. INVENTOR WITNESSES ATTORNEY FELIX SELBY, OF CHICAGO, ILLINOIS.

TOOL-HOLDER.

To all whom it may concern:

Be it known that I, FELIX SELBY, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Tool-Holders, of which the following is a specification.

This invention has relation to tool holders for planers, lathes or the like, and the nature and objects thereof will be readily apparent to those skilled in the art to which it appertains, in the light of the following explanation of the accompanying drawings, illustrating what I now believe to be the preferred embodiment or mechanical expression, of my invention from among other forms and arrangements thereof, within the spirit of the invention and the scope of the appended claims.

However, an object of the invention is to provide a tool holder for lathes, planers and other machine tools which is capable of releasing the tool from engagement with the work during a return movement of the work, so as to obviate the drag on the tool which occurs in tool holders designed to hold the tool rigidly, during both the, forward and return strokes, of the machine.

Another object of the invention is to provide a tool holder of the character described, wherein the holder may be rotated so as to withdraw the tool from engagement with the work, for the purpose of inserting a new tool into the holder.

Another object of the invention is to provide a tool holder wherein the tool is but slightly spaced above the work thereby permitting the toolto enga e the lowermost edge of the work when making aside out.

In addition to the foregoing my invention comprehends improvements in the details of construction and arrangement of parts to be hereinafter described and particularly pointed out in the appended .claims.

In the drawings in which similar and corresponding parts are designated by the'same characters of reference throughout thesev- 'eral views in which they appear:

Figure 1, is a view in side elevation of a right-hand tool holder constructed after the manner of my invention.

Fig. 2, is a front view thereof.

Fig. 3, is a horizontal section on the line 3-3 of Fig. 2, and

Fig. 4, is a view in front elevation of the Specification of Letters Patent. Patented 1 12 1 91 8 Application filed May 9, 1916. 1 Serial no. 96,395.

lower end of the shank, with the tool holder removed therefrom.

Wlth reference to the drawings 1 indicates the shank of my tool holder which is formed with a cylindrical recess or socket 2, at one end thereof, the inner end of the socket being intersected by a recess 4 in which is seated a rivet member or the like 5. The tool holder 6, the configuration of which is substantially shown n Flg. 3 is formed with a cylindrical pro ectlon 7 extending from one face thereof for engagement in the socket 2 of the shank. An opening 8 is formed centrally and longitudinally through the projection 7 for the reception of a coil spring 9, one end of wh ch is curved at 10 to form a hook for engaging the rivet 5, while the other end of the spring is also formed with a hook portion 11 for engaging within a recess 12 at the outer face of the tool holder body portlon, whlch recess extends substantially parallel to the opening containing the spring.

It will be apparent from the above that the body portion of the tool holder is capable of relative horizontal rotary motion with relation to its shank, but against the tension of the spring, inasmuch as said rotative movement is resisted by the. twisting stress which would thus be applied to said spring.

The tool is held in a rectangular opening 13 extending through the body portion of the tool holder, and is secured therein by set screws (not shown) adapted to engage threaded openings 14, provided in enlargements 15 formed upon the side of the body portion.

The body portion 6 of the tool holder, is formed at one corner with a concave face 16, in which a depending lug 17 on the lower face of the shank, is adapted to be seated, under the influence of the torsional stress of the spring 19. The relation, of the lug to the tool holder is best illustrated in Fig. 3, wherein it will be apparent that rotation of the tool holder 6 in a clockwise direction is precluded owing to the obstruction provided by the lug 17. The lug 17 is provided at its lower face with an annular beveled portion 17, for engagement with a corresponding beveled edge 17, formed at the lower edge of the concave face 16. A second concave face 16 is provided upon the tool holder portion adjacent the convex face 16 thereof which is a continuation of the face formed with a central recess 3 '16. In the position of the tool holder portion illustrated in Fig. 3, vertical downward movement of saidtOOl holder portion is prevented first, by the spring '9, and second by the provision of the beveled edge 17 a upon which the tool holder rests in this position. In order to entirely tool holder portion from the shank, it is necessary to rotate the tool holder portion until the concave face 16'" is brought mto relation with the stop 17 whereupon clear ance for the edge 17 is permitted through the concave face 16*.

The shank of the tool holder is adapted to be secured to the clapper box of a planer after the fashion of the usual form of tool holder, and if a right-handed tool holder is to be used, its relation to the work will be as shown in Fig. 2 which is a front elevation thereof. In that figure the work is illustrated in dotted outline, and is seen to consist of a ledge to be undercut, a task for which this tool holder is especially adapted.

\Vith reference to Fig. 3, and assuming that the tool holder is held stationary, when the work is traveling in the direction 7 of the heavy arrow, that is, during a work ing stroke, rotation of the holder 6 is precluded in the manner mentioned above, and the tool is consequently held in engagement with the work. However, during a return movement of the work in the direction indicated by the dotted arrow, the holder 6 is permitted to rotate against the tension of the spring 9, thereby disengaging the tool from the work and relieving the drag thereof, and eliminating friction between the point of the tool and the work which would otherwise occur during a return stroke, were it not for the resilient connection afforded between the tool holder and its shank.

Owing to the fact that the lower face of the tool holder is flattened, and the tool adapted to be disposed closely adjacent said lower face, I am enabled to reach the lowermostsurfaces of the work to a degree heretofore unobtainable in tool holders of the conventional type. This feature is illustrated in Fig. 2.

It will be noted that the holder portion is held to the shank by means of the spring 9 and the beveled edge 17 Owing to this arrangement the interchanging of tools is facilitated as the holder 6 may be readily and quickly disengaged from the shank by disengaging the ends 11 of the spring from its recess 12, and the tool removed therefrom, and another substituted. The holder may then be reengaged upon the shankand the end 11 of the spring reseated in its recess. This feature in connection with other features, enables one to reduce the time consumed in planing surfaces, to a "degree heretofore unobtainable. This tool holder may disengage the r be employed to advantage in connection with a lathe when cutting threads on large diameter work. The device may also be employed in many other ways which will become apparent, and suggest themselves to artisans as they become familiar with its use.

Various ways of constructing my invention will occur to those skilled in the mechanical arts, and I therefore reserve the right and privilege of changing the form of the details of construction, or otherwise altering the arrangement of parts without departing from the spirit of the invention or the scope of the appended claims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is 1. A tool holder including a shank having a socket, a tool holding body portion, a projection on said body portion for en gaging in the socket to afford relative rotation of the shank and body portion, the projection and body portion having a central longitudinal opening, a coil spring seated in said opening and having its terminals connected to the shank and body portion to resist rotation of said body portion in one direction, and a lug on the shank, engageable by the body portion for limiting its movement in the opposite direction. I

2. A tool holder including a shank having a socket in its lower face, a't'ool holding body portion, a cylindrical projection on the body portion for engagement in the socket to afford connective means and relative rotation of the shank and body portion, an axial opening provided in the projection, opening and having its terminals connected to the body portion and the shank to resist rotation of said body portion in one direction, and a lug formed on the shank and engageable'by the body portion to limit rotation of said'body portion in the opposite direction.

3. An undercut tool holder for planers, including a shank adapted to be rigidly. held, a tool holder body portion pivoted to one end of the shank for rotation in a plane at substantially right angles to the longitudinal axis of the shank, a coil spring loa coil spring disposed in the axial cated in the axis of rotation of the body portion for resisting rotation of said body portion in one direction, anda stop for limiting its movement in the opposite direction.

4. An undercut tool holder for planers including a shank, a tool holding body portion pivotally mounted upon said shank,

means for limiting movement of the body portion in one direction or when in cutting vposition,means engaging the body portion when in said position for preventing accidental disengagement of the body portion from the shank, said last mentioned means being disengaged by the body portion when said body portion is moved in a reverse or non-cutting direction, and a resilient element utilizable conjunctively to hold the body portion to the shank, and for resisting movement thereof in said reverse direction.

5. An undercut tool holder for planers including a shank, a stop lug on said shank,

a lateral projection on said lug, a tool holding body portion pivoted to said shank for movement relative thereto and engageable upon the lug to limit movement of the body portion in one direction, said projection Copies of this patent may be obtained for five cents each, by addressing the being adapted to engage the body portion when said body portion engages the lug to prevent accidental separation of the body portion from the shank, said body portion disengaging itself from the projection when rotated in a reverse direction, and resilient means for resisting such reverse movement of the body portion.

In testimony whereof I aflix my signature in presence of tWo Witnesses.

FELIX SELBY.

Witnesses:

WILLIAM R. SCHULTZ, Or'ro J. MEIER.

commissioner of Patents,

Washington, D. G. 

